<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>12-21</title>

</head>
<body>
<script>
  function showTime(n,s){
    document.getElementById("demo").innerHTML=Date();
    alert(isNaN('个'));
  }
</script>
    <button onclick="showTime('2',1)">按钮</button>
    <p id="demo">这是一个段落</p>
    <button onclick="alert(111)">提示</button>
</body>
</html>
